69120

Appears in sequences

• Number of similarity classes of descendants created by bisection refinement from an initial n-simplex.at n=4A019999
• a(n) = n + (n+1)^2 + (n+2)^3 + (n+3)^4.at n=13A027621
• Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j)*12^j (with i, j >= 0).at n=18A038218
• Triangle whose (i,j)-th entry is binomial(i,j)*10^(i-j)*12^j.at n=13A038314
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*2^j.at n=17A038328
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*10^j.at n=11A038336
• Expansion of e.g.f. 3*x/(1 - 2*x).at n=6A052676
• a(n) = tau( sigma_n(n) ), where tau is the number of divisors of n.at n=29A064165
• a(n) = phi(binomial(2n, n)).at n=9A066973
• 13-almost primes (generalization of semiprimes).at n=16A069274
• a(n) = A062401(2^n + 1).at n=18A096855
• Highly totient numbers: each number k on this list has more solutions to the equation phi(x) = k than any preceding k (where phi is Euler's totient function, A000010).at n=28A097942
• Greatest common divisor of multiperfect numbers and their totient.at n=11A098204
• Triangle read by rows: coefficients of polynomials E(n,x) related to partitions with parts occurring at most thrice.at n=27A098494
• Number of divisors of A104350(n).at n=26A104352
• Numbers k such that k! is the product of exactly four smaller factorials.at n=23A109097
• Numbers k such that k! is the product of exactly 5 smaller factorials (greater than 1).at n=24A109098
• Numbers k such that k! can be expressed as the product of smaller factorials > 2.at n=26A109099
• Numbers k such that k! can be expressed as the product of the factorials of prime numbers, repetitions allowed.at n=35A109104
• Triangle read by rows: T(n,k) is the number of double rise-bicolored Dyck paths (double rises come in two colors; also called marked Dyck paths) of semilength n and having k peaks (1 <= k <= n).at n=47A114656